Power analysis for the design of a large area ultrasonic tactile touch panel Yi Yang, Betty Lemaire-Semail, Frédéric Giraud, Michel Amberg, Yuru Zhang and Christophe Giraud-Audine Eur. Phys. J. Appl. Phys., 72 1 (2015) 11101 Published online: 11 September 2015 DOI: 10.1051/epjap/2015150051